96e863f0f3
This can be very useful for some purposes:
* It makes it possible to disable the UART in cases where it is not
needed or needs to be disabled to conserve power.
* It makes it possible to disable the serial output to reduce code
size, which may be important for some chips. Sometimes, a few kB can
be saved this way.
* It makes it possible to override the default, for example you might
want to use an actual UART to debug the USB-CDC implementation.
It also lowers the dependency on having machine.Serial defined, which is
often not defined when targeting a chip. Eventually, we might want to
make it possible to write `-target=nrf52` or `-target=atmega328p` for
example to target the chip itself with no board specific assumptions.
The defaults don't change. I checked this by running `make smoketest`
before and after and comparing the results.
68 строки
1,1 КиБ
Go
68 строки
1,1 КиБ
Go
// +build nucleof722ze
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package machine
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import (
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"device/stm32"
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"runtime/interrupt"
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)
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const (
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LED = LED_BUILTIN
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LED_BUILTIN = LED_GREEN
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LED_GREEN = PB0
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LED_BLUE = PB7
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LED_RED = PB14
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)
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const (
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BUTTON = BUTTON_USER
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BUTTON_USER = PC13
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)
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// UART pins
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const (
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// PD8 and PD9 are connected to the ST-Link Virtual Com Port (VCP)
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UART_TX_PIN = PD8
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UART_RX_PIN = PD9
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UART_ALT_FN = 7 // GPIO_AF7_UART3
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)
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var (
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// USART3 is the hardware serial port connected to the onboard ST-LINK
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// debugger to be exposed as virtual COM port over USB on Nucleo boards.
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UART1 = &_UART1
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_UART1 = UART{
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Buffer: NewRingBuffer(),
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Bus: stm32.USART3,
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TxAltFuncSelector: UART_ALT_FN,
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RxAltFuncSelector: UART_ALT_FN,
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}
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DefaultUART = UART1
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)
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func init() {
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UART1.Interrupt = interrupt.New(stm32.IRQ_USART3, _UART1.handleInterrupt)
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}
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// SPI pins
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const (
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SPI0_SCK_PIN = PA5
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SPI0_SDI_PIN = PA6
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SPI0_SDO_PIN = PA7
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)
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// I2C pins
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const (
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I2C0_SCL_PIN = PB8
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I2C0_SDA_PIN = PB9
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)
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var (
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// I2C1 is documented, alias to I2C0 as well
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I2C1 = &I2C{
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Bus: stm32.I2C1,
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AltFuncSelector: 4,
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}
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I2C0 = I2C1
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)
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